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GB1356982A - Process control system - Google Patents

Process control system

Info

Publication number
GB1356982A
GB1356982A GB1911871A GB1911871A GB1356982A GB 1356982 A GB1356982 A GB 1356982A GB 1911871 A GB1911871 A GB 1911871A GB 1911871 A GB1911871 A GB 1911871A GB 1356982 A GB1356982 A GB 1356982A
Authority
GB
United Kingdom
Prior art keywords
controller
correctors
amplifier
june
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1911871A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Melyepitesi Tervezoe Vallalat
Original Assignee
Melyepitesi Tervezoe Vallalat
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Melyepitesi Tervezoe Vallalat filed Critical Melyepitesi Tervezoe Vallalat
Publication of GB1356982A publication Critical patent/GB1356982A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
    • G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B11/00—Automatic controllers
    • G05B11/01—Automatic controllers electric
    • G05B11/26—Automatic controllers electric in which the output signal is a pulse-train
    • G05B11/28—Automatic controllers electric in which the output signal is a pulse-train using pulse-height modulation; using pulse-width modulation
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B11/00—Automatic controllers
    • G05B11/01—Automatic controllers electric
    • G05B11/32—Automatic controllers electric with inputs from more than one sensing element; with outputs to more than one correcting element

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Feedback Control In General (AREA)

Abstract

1356982 Automatic control systems MELYEPITESI TERVEZO VALLALAT 4 June 1971 [13 June 1970] 19118/71 Heading G3R In a system in which a plurality of process variables are controlled by a like number of detectors and correctors by sequentially switching a single two or three point controller, disturbance caused by switching transients is prevented by providing a delay device after the controller so that the correctors do not respond until after the transient condition has terminated. The variables (unspecified) of a liquid 1 fed continuously into and out of a tank are measured and the corresponding signals on lines 4, 5, adjusted as necessary at 6, 7, are sequentially switched at 8 to an amplifier 9 and thence to an indicator 10 and controller 11. 12 is the delay unit whose output is switched, also at 8, to correctors, e.g. valves, 13, 14. The controller 11 effectively operates by pulse width modulation since it produces a pulse from the end of the delay until the output of amplifier 9 reaches a predetermined value, and this depends upon the time constant of the amplifier (its output changes exponentially from the end of the transient) and the magnitude of the measured variable.
GB1911871A 1970-06-13 1971-06-04 Process control system Expired GB1356982A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
HUME001233 1970-06-13

Publications (1)

Publication Number Publication Date
GB1356982A true GB1356982A (en) 1974-06-19

Family

ID=10999223

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1911871A Expired GB1356982A (en) 1970-06-13 1971-06-04 Process control system

Country Status (4)

Country Link
AT (1) AT310299B (en)
CH (1) CH524193A (en)
DE (1) DE2123340A1 (en)
GB (1) GB1356982A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10227440A1 (en) 2002-06-20 2004-01-08 Mitsubishi Polyester Film Gmbh Multi-layer, transparent, film made of PET and PEN with at least one functional outer layer for the production of composite packaging with UV protection

Also Published As

Publication number Publication date
CH524193A (en) 1972-06-15
AT310299B (en) 1973-09-25
DE2123340A1 (en) 1971-12-23

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed